You are conducting a study to determine the effects of chemotherapy on the survi

Question

You are conducting a study to determine the effects of chemotherapy on the survival of subjects with pancreatic carcinoma. Subjects are enrolled at diagnosis and treated immediately after staging. You observed 5 subjects for an average of 12 months each before the occurrence of death, loss to follow-up, or study termination; 3 of these subjects die. You observe 10 subjects for an average of 6 months each, and 5 die. You observe 10 subjects for an average of 18 months each, and 7 die. What is the total observation period?

Explanation / Answer

The total observation period of chemotherapy is calculated by

In first observation, 5 subject for 12 months, bu only 2 survived means=24 months

In second observation, 10 subject for 6 months, bu only 5 survived means=30 months

In third observation, 10 subject for 18 months, bu only 3 survived means=54 months

therfore total time 108 months

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